$$F=(((((27+22)-30)+36)+25)-(2 \times 30))+(17+11)$$
$F=48$
$$F=49-30+36+25-2\times 30+17+11$$
$$F=19+36+25-2\times 30+17+11$$
$$F=55+25-2\times 30+17+11$$
$$F=80-2\times 30+17+11$$
$$F=80-60+17+11$$
$$F=20+17+11$$
$$F=37+11$$
$$F=48$$
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$F≔48$